Shaft and Bearing

In a variable capacitor, the shaft and bearing assembly is a critical mechanical component that facilitates the adjustment of capacitance. The shaft provides the rotational axis for moving plates, while the bearings ensure minimal friction and precise alignment, allowing for accurate tuning and stable operation of the capacitor across its adjustment range. This assembly is typically used in applications requiring variable capacitance, such as tuning circuits in electronic devices. The shaft transmits rotational force from the tuning knob to the capacitor's moving plates, and the bearings (commonly ball or sleeve bearings) reduce friction between the rotating shaft and the stationary housing, enabling smooth, low-torque rotation and maintaining precise axial and radial alignment for consistent electrical performance. The materials on file for this component include stainless steel, brass, and bronze, which are selected for their mechanical properties and suitability in precision applications. The key parameters to verify for a specific application include shaft diameter and length, bearing inner and outer diameter, and overall assembly tolerance for fit and alignment, all specified in millimeters. These parameters must be confirmed with the legal manufacturer or supplier to ensure compatibility with the intended variable capacitor design. The assembly's performance directly affects the tuning accuracy and stability of the capacitor, making it essential to select appropriate materials and dimensions based on the application's requirements. Regular inspection for wear, play, or misalignment is recommended to maintain optimal performance. This directory entry provides a general description; actual specifications and standards must be verified with the manufacturer or supplier for the specific model.

The shaft transmits rotational force from the tuning knob to the capacitor's moving plates. Bearings (typically ball or sleeve bearings) reduce friction between the rotating shaft and the stationary housing, enabling smooth, low-torque rotation and maintaining precise axial and radial alignment for consistent electrical performance.